EPICS Re: Strange memory leak with ADAravis

1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 <2022> 2023 2024	Index	1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 <2022> 2023 2024
<== Date ==>		<== Thread ==>

> I noticed that PollUsedMem.SCAN was set to “1 second”, when it was set to 1 second the buffers used and allocated were increasing by around 10-20 frames/s, when I set it to I/O Intr the buffers counts were constant and memory usage was perfectly fine.

SCAN=I/O Intr does not work for PoolUsedMem.SCAN, you need to use a periodic scan rate like "1 second". If you use I/O Intr it is not getting the statistics, so it is just hiding the problem.

You said that when it was 1 second the buffers used and allocated were increasing by 10-20 frames/s. That does not make sense for the screen shot you sent, because the acquisition time was 10 seconds. Your commonPlugins.adl screen shows you only have 2 plugins loaded and active, NDPluginStdArrays and NDPluginStats. In the worst possible case under those conditions, if both plugins and the camera had a memory leak, the number of buffers used and allocated could only increase by 0.1 frames/s * 3 = 0.3 frames/s. Were you really using a 10 second acquire time when you had the problem?

Please change PoolUsedMem.SCAN to 1 second and report again how the buffers used and allocated are increasing under the exposure time conditions you use when you have seen the memory problem in the past.

> Please note that in this setup (while also failing before) I set QSIZE in the st.cmd to 3000 then 10000.

I am confused, your screen shot of commonPlugins.cmd shows that QSIZE was set to 100 (Free column), not 3000 or 10000. For these plugins there is no reason to set a QueueSize that large. Generally you only need a large queue size like that for the file saving plugins, where you want to buffer frames because the camera is collecting faster than the files can be saved to disk. Note that QueueSize is normally in autosave, so the value in use may not be the QSIZE you set in the file. You can change it in the main medm screen for that plugin.

Mark

Hello Mark

I mistakenly rebooted the IOC when huge buffers were allocated (+120K), so I attached an image of the working setup. I noticed that PollUsedMem.SCAN was set to “1 second”, when it was set to 1 second the buffers used and allocated were increasing by around 10-20 frames/s, when I set it to I/O Intr the buffers counts were constant and memory usage was perfectly fine. Please note that in this setup (while also failing before) I set QSIZE in the st.cmd to 3000 then 10000.

Best Regards,

Abdalla.

From: Mark Rivers <rivers at cars.uchicago.edu>
Sent: Monday, September 19, 2022 6:41 PM
To: Abdalla Ahmad <Abdalla.Ahmad at sesame.org.jo>
Cc: tech-talk at aps.anl.gov
Subject: Re: Strange memory leak with ADAravis

After this happens please send the screen shots for ADAravis and commonPlugins.

If it will take a long time to fail then just send the screen shots when it is working normally at the frame rate you use when it fails.

Mark

Sent from my iPhone

On Sep 19, 2022, at 6:08 AM, Abdalla Ahmad <Abdalla.Ahmad at sesame.org.jo> wrote:

Hello Mark

This memory leak issue just happened again with similar numbers for pool statistics PVs on the same setup, I will be testing the same setup on a rocky Linux machine and tell you the results. Note that it happens after 15-20 minutes from running the IOC, also the empty free list command did not free the queues. Do you have some pointers on where to start debugging in the drivers’ stack? (AD core, aravis, etc.)

Thanks!

Abdalla.

From: Mark Rivers <rivers at cars.uchicago.edu>
Sent: Thursday, June 2, 2022 1:46 PM
To: tech-talk at aps.anl.gov; Abdalla Ahmad <Abdalla.Ahmad at sesame.org.jo>
Subject: Re: Strange memory leak with ADAravis

Hi Abdalla,

What areaDetectors plugins do you have running and what is the value of QueueSize for each of them? The Buffers information you sent is very useful. It says that the current number of buffers (NDArrays) in use is only 22. But it has allocated 24664 of them, and they are in the pool, using 28904 MB of memory. Can you send a screen shot of the commonPlugins.adl screen?

I can think of two possibilities for this:

The system got very busy for a while, and plugins were not able to keep up with the camera. That will cause each active plugin to fill its queue. If there were 12 plugins and each had QueueSize of 2000 that would explain it.
There is a leak in the driver or some plugin which is causing the pool to grow. But then I would expect PoolUsedBuffers to be large. I would also expect someone else to have reported that problem by now.

Note that in the Buffers section of the detector screen there is button to Empty Free List. That processes the EmptyFreeList record, which will free all of the unused buffers and reduce the memory without restarting the IOC.

Mark

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Abdalla Ahmad via Tech-talk <tech-talk at aps.anl.gov>
Sent: Thursday, June 2, 2022 4:57 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Strange memory leak with ADAravis

Hi

I have setup area detector to control the Basler gigE cameras we have, I pulled the latest tag for all the necessary modules (asyn, ADCore, ADAravis, etc). The setup works fine, I can control the camera and acquire images even at the maximum FPS which is 32. Now I configured the IOC to control 2 cameras, one with exposure time 10 s and one with 32 FPS and left it overnight few days ago. I got to the PC the day after and the RAM and swap were full but the IOC was working, I managed to login to the PC later and launched the GUI and I found strange values in the Buffers section of ADAravis.adl:

PoolUsedBuffers: 22

PoolAllocBuffers: 24664

PoolFreeBuffers: 24642

PoolMaxMem: 0 MB

PoolUsedMem: 28904.3

The PC has is running CentOS 7 and has 8GB RAM. I re-ran the IOC yesterday and for now it is working fine. What could be wrong with my setup? The network is all gigabit Ethernet and jumbo frames are enabled.

Thanks

Abdalla.

Subject:	Re: Strange memory leak with ADAravis
From:	Mark Rivers via Tech-talk <tech-talk at aps.anl.gov>
To:	Abdalla Ahmad <Abdalla.Ahmad at sesame.org.jo>
Cc:	"tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date:	Wed, 21 Sep 2022 12:01:55 +0000

Experimental Physics and Industrial Control System